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Mono Project

The Mono Project is an open-source, cross-platform implementation of Microsoft's .NET Framework based on the ECMA standards for C# and the Common Language Runtime. The runtime, compilers, tools and most class libraries are MIT-licensed, and upstream stewardship has passed to the WineHQ organization.

Licensing at a Glance

  • Open source

  1. The Mono runtime, compilers and tools and most of the class libraries are licensed under the MIT license; some runtime code is BSD-licensed and some class libraries are under Apache 2.[1]

  2. The Mono runtime and tools were relicensed to the MIT license as of 31 March 2016.[2]

  3. The licensing FAQ states that commercial and proprietary applications can be written to run with Mono.[3]

  4. Microsoft has issued a patent promise not to assert applicable patents against making, using or distributing Mono; the promise terminates for anyone who brings a patent claim against Mono.[4]

  5. The last major Mono release was in July 2019, the last patch release in February 2024, and the WineHQ organization has taken over as steward of the upstream project.[5]

Products

References

  1. FAQ: Licensing | Mono · mono-project.com · retrieved 2026-09-27
  2. FAQ: Licensing | Mono · mono-project.com · effective 2016-03-31 · retrieved 2026-09-27
  3. FAQ: Licensing | Mono · mono-project.com · retrieved 2026-09-27
  4. FAQ: Licensing | Mono · mono-project.com · retrieved 2026-09-27
  5. Home | Mono · mono-project.com · retrieved 2026-09-27
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